Gas burner having lateral openings and a device for deflecting the flames upwards

ABSTRACT

A gas burner according to the invention comprises: a mixing chamber having a thin, vertical, lateral wall perforated by outlets for the combustion mixture, a deflector disposed inside the mixing chamber; said deflector having a slanting part which directs the flames upwards in a slanting manner, and a cover coated with a self-cleaning catalytic enamel. The cover may be made of metal or ceramic material. The burner also comprises a crown for distributing the heat during cooking operations requiring low heat.

United States Patent 1191 Capy 1 1 Nov. 25, 1975 [54] GAS BURNER HAVINGLATERAL 2,960,157 11/1960 Dolby 431/349 OPENINGS AND A DEVICE FOR3,279,455 10/1966 Corey 126/92B 3,580,733 5/1971 Ott 117/129 DEFLECTINGTHE FLAMES UPWARDS 3,738,577 6/1973 Blanzy et a1. 239/553 [75] Inventor:Marcel Capy, Olivet, France 3,817,689 6/1974 Capy 431/349 [73] Assignee:Compagnie Europeenne pour FOREIGN PA R APPLICATIONS IEquipement Menager,CEPEM, 739,391 10 1932 France 239/567 Paris, France [22] Filed. Apr 11974 Primary Examiner-Carroll B. Dority, Jr.

' Attorney, Agent, or Firm-Sughrue, Rothwell, Mion, [21] Appl. No.1456,699 Zinn & Macpeak Related US. Application Data 57 STRACT [62]Division of Ser. No. 306,775, Nov. 15, 1972, Pat. No. 1 AB 3 3,317 39 Agas burner according to the invention comprises: a mixing chamber havinga thin, vertical, lateral wall [52] US. Cl. 239/553; 239/567; 239/568perforated y Outlets for the combustion e, a 51 int. c1. B0513 1/14deflector i p i i the i ing cha be said de- [58] Field of Search431/347, 349; 239/553, flecwr having a slanting p which directs theflames 239/5535 559 567 563 upwards in a slanting manner, and a covercoated with a self-cleaning catalytic enamel. The cover may be [56]References Cit d made of metal or ceramic material. The burner alsoUNITED STATES PATENTS comprises a crown for distributing the heat during1,156,845 10/1915 James 239/567 cookmg operanons requrmg low heat2,142,014 12/1938 Zink 239/5535 3 Claims, 8 Drawing Figures US. PatentNov. 25, 1975 Sheet10f3 3,921,913

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U.S. Patent Nov. 25, 1975 Sheet3of3 3,921,913

FIG? 11 22 21 GAS BURNER HAVING LATERAL OPENINGS AND A DEVICE FORDEFLECTING .THE FLAMES UPWARDS This is a division of application Ser.No. 306,775 filed Nov. 15, 1972 and now U.S. Pat. No. 3,817,689.

BACKGROUND OF THE INVENTION 1. Field of the Invention A,

The present invention relates to a gas burner comprising a mixingchamber having a substantially cylindrical thin, lateral wall withvertical generatrices perforated by outlets for the combustion mixture.More particularly, I it relates to circular burners for cooking stoves.

2. Prior Art Gas burners with a thick cast metal wall are already known,in which it is possible to direct the flames upwards in a slantingmanner by directing the apertures in the cylindrical vertical wall. Thisinsures better heat output/and cleaner combustion by reducing theproportion of unburned and incompletely burned gas. Less expensiveburners of a simpler design and made of thin sheet metal, are alsoknown. Burners of this type have the particular disadvantage of becomingsoiled when the liquid in a container placed on the burner, boils over.On the other hand, a certain amount of lining occurs, i.e. the enamelcracks during operation of the burner when the burner cover is made ofordinary enamelled metal, due to the disparities in temperature betweenthe periphery and the centre.

SUMMARY OF THE INVENTION The object of the present invention is toprovide a gas burner with a cover adapted to withstand without damagethe thermal stresses produced by temperature disparities during theoperation thereof.

Another object of the invention is to make it possible to dismantle thecover.

Yet another object of the invention is to eliminate the cleaning processas'the cover is self-cleaning.

The gas burner according to the invention is characterized in that itcomprises a cover which is resistant to thermal stresses, and adeflector which is disposed inside the mixing chamber and whichcomprises a slanting part for directing the flames upwards in a slantingmanner.

Advantageously, the burner according to the invention also comprises atleast one of the following features: the cover is coated with acatalytic. enamel, thus rendering the burner self-cleaning; the cover ismade of metal coated with a catalytic enamel; the burner cover is madeof ceramic material; the ceramic cover comprises a lower wall having aslanting part forming a deflector which directs the flames upwards in aslanting manner; the ceramic cover is arranged with a deflector made ofthin metal, at the --upper part of the burner body; the ceramic cover isplaced on the burner, the deflector comprising a solid base; the covercomprises a horizontal part covering the flames in the low intensityarea.

Other features of the present inventionwill be made apparent from thefollowing detailed description of. the preferred embodiments thereof,provided by way of non-limitative examples, and from the accompanyingdrawings representing said embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an axial sectional viewof a gas burner according to the invention. H FlGS. 2-8 show variants ofthe burner according to the invention.

DESCRIPTION OF THE PREFERRED I EMBODIMENTS FIG. 1 shows an embodiment ofa burner according to the invention. It comprises a venturi l, thecollar 2 of which supports a lower circular pan 3, with the exceptionof3 bosses such as 4, distributed at an angle of 120 from each other andserving to calibrate the pilot opening 5. The pan 3 supports a circularmixing chamber, comprising a burner pan 6 having a cylindrical,vertical, lateral wall, provided with extended discharge apertures 7 forthe main flames. lts base 8 is perforated by apertures 9 supplying theexpansion chamber 10, defined by the pan 3. The circular mixing chamberalso comprises a slightly convex cover 11 and a frusto-conical deflector12. The cover and the deflector are rendered integral with the wall ofthe mixing chamber by monoxide.

Each of the parts constituting the burner can thus be made of inoxidablethin sheet metal adapted for regular service conditions or suitablyprotected. The cover 11 is coated with catalytic enamel prior to thecrimping operation.

In the embodiment shown in FIG. 2, the burner comprises a venturi 1having a peripheral collar 2 which supports a lower circular pan 3, withthe exception of 3 bosses 4 distributed on the circumference and servingto calibrate a pilot opening 5. The pan 3 supports a circularmixingchamber 6, comprising a burner pan 8 having a cylindrical, vertical,lateral wall provided with extended discharge apertures 7 for the mainflames. Its base 8 is perforated by apertures 9 supplying the pilotchamber 10. It also comprises a slightly convex cover 11 coated with acatalytic enamel and a deflector 12 having a frusto-conical lateral walland an incurvated solid base 13. The cover 11 and the deflector 12 are vrendered integral with the wall of the mixing chamber by crimping theupper edge 14 over the edges of these parts. The main flames aredeflected upwards in a slanting manner by the deflector 12. Thisdeflector 12 is solid and it defines the chamber 6 for mixingcombustible gas and primary air. The volume of the mixing chamber may bevaried by giving the base of the deflector a flat shape or a more orless incurvated shape according to the gas used, its pressure and thecapacity of 3 chamber situated below the wall 8. The burner alsocomprises a slightly convex cover 11 and a deflector l2 having afrusto-conical lateral wall and a solid or hollow base. The cover 11 andthe deflector 12 are rendered integral with the wall of the mixingchamber by crimping the upper edge 14 of this wall over the edges ofthese parts. The main flames are deflected upwards in a slanting mannerby the deflector 12.

The cover 11 is made of ceramic material and it may also be coated witha catalytic enamel. The use of a catalytic enamel allows the burner tobe kept permanently clean.

FIG. 4 shows a burner of the same type, comprising the same elements asthat of FIG. 3 but in which the cover 11 and the deflector 12 arereplaced by a single ceramic part 11 forming both a burner cover and adeflector redirectingthe flames upwardly. For this reason, the lowerpart of the member 11 is the same shape as the deflector in FIG. 2,i.e., it comprises at least one part shaped in the form of an invertedtruncated cone directing the flames in a slanting manner upwards. The

edge of the lateral wall 14 of the mixing chamber is crimped over theedge of the cover 11.

FIG. 5 shows another variant of the burner in which the cover 11consists of a ceramic tablet which is simply placed on the burner. Inthis case, the deflector 12 made of thin sheet metal, is solid andismounted at 14 on the edge of the lateral wall of the burner body in sucha manner as to close the mixing chamber. The edge of the tablet 11comprises an inclined part 17 allowing the tablet to be applied to andcentred on the deflector-burner body assembly.

FIGS. 6, 7 and 8 show embodiments of burners according to the invention,permitting a low intensity heating action to be obtained more easily incontainers used for the cooking operation known as simmering and furtherpermitting the heat to be distributed in a uniform manner under the baseof the cooking utensils.

It is already known in the art to obtain this type of effect byinterposing a concave metal screen between the burner head and thecontainer. The metal screen thus acts as a diffuser. I

When the metal screen is integral with a grill which supports thecontainers to be heated, this screen is soldered to the grill and thesoldered joints are situated in the flame when the burner is on high.For this reason it is necessary to use soldering materials having a veryhigh point of fusion. Furthermore, the incorporation of this type ofmetal screen considerably compli cates the manufacture of the grill. Itis possible to use a metal screen known as a diffuser, which is placedon the grill without a screen. A diffuser of this type, which generallyhas fairly large dimensions in order to support the cooking utensils,must be removed from the grill when the burner is fully turned on.

A gas burner according to the invention does not have the disadvantagesof known burners when used for simmering. Neither does a metal screenhave to be interposed between the burner and the container to be heated.

A gas burner adapted for low intensity cooking is produced bysurrounding the lateral wall of the mixing chamber and the upper part ofthe same with a horizontal crown which is flat or slightly concavetoward the base. The outer diameter of the crown is one-third to twicethe inner diameter so as to cover the flames when the burner is operatedatits minimum rate.

FIG. 6 shows a burner havingan enamelled metal cover. As in FIG. 1, itconsists of a venturi, the collarof.

which supports a lower circular pan 3, with the exception of 3 bossessuch as 4. These bosses, which are used to calibrate the pilot opening,are distributed at an angle of from each other. The pan 3 supports acircular mixing chamber comprising a burner pan '6 having a cylindrical,vertical, lateral wall provided with extended outlets 7 for the mainflames. The horizontal crown 20 forms an extension of the vertical wall.The

base 8 of the burner pan is perforated by openings 9 supplying theexpansion chamber limited by the pan 3. The mixing chamber alsocomprises a deflector 12 having a frustoconical lateralwall, a convexbase and a slightly convex cover 11. The cover 11 and the des' flector12 are rendered integral with the pan 6 of the mixing chamber bycrimping the upper edge 21 of the crown of the pan over the edges ofthese parts. The crown 20 may be flat or slightly convex. Its outerdiameter is in the order of one-third to twice its inner diameter whichis also that of the vertical wall of the pan6.

limiting the mixing chamber.

FIG. 7 shows a burner with a ceramic cover 11. The 3 reference numeralsused in FIG. 7 have the same meanjoined by crimping the upper edge 21 ofthis pan over the edge of the cover.

FIG. 8 shows a burner, with a ceramic cover 11. The

cover is detachable. The reference numerals used in FIG. 8 have the samemeaning as those used in FIGS. 1,

6 and 7 but the venturi has not been represented. The.

ceramic cover 11 comprises a crown 22.It rests on the assembly formed bythe metal deflector 12 and the pan 6 which are joined by crimping theupper edge 23.0f this pan over the edge of the deflector.

Obviously, the sheet metal or ceramic cover may als I be enamelled witha catalytic enamel.

The invention, which has been described, may obvi-.

ously be modified in various ways without departing from the scope ofthe invention andcertain elements may be replaced by others having thesame technical function.

What is claimed is:

1. In a thin-walled burner having a mixing chamber defined by asubstantially cylindrical, thin, lateral wall with vertical generatricesperforated by vertical slots for the combustion mixture, the improvementcompris- 7 ing a single piece cover means made of ceramic materialattached to the upper edge of said lateral wall by a crimped portion,said cover means including a lower,

face adjacent said slots inclined inwardly of said wall and away fromsaid upper edge which constitutesa fuel deflector.

2. A burner according to claim 1 wherein said lower face is in the formof a truncated cone so as to deflect the fuel upwards in a slantingmanner.

3. A gas burner according to claim 1 wherein the outer diameter of thecover and deflector means is onethird to twice the inner diameter of thevertical generatrices defining the mixing chamber.

UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTIONPATENT NO. 1 3,921,913

DATED November 25 1975 lN\/ ENTOR(S) 1 Marcel CAPY It is certified thaterror appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below: 0

IN THE HEADING:

ADD:

D Foreign Application Priority Data November 15 1971 France 7140801Signed and Sealed this Q twenty-fourth Day Of February 1976 [SEAL]Arresr:

Q RUTH C. MASON c. MARSHALL DANN Arresting Officer CommissionerufParenrs and Trademarks

1. In a thin-walled burner having a mixing chamber defined by asubstantially cylindrical, thin, lateral wall with vertical generatricesperforated by vertical slots for the combustion mixture, the improvementcomprising a single piece cover means made of ceramic material attachedto the upper edge of said lateral wall by a crimped portion, said covermeans including a lower face adjacent said slots inclined inwardly ofsaid wall and away from said upper edge which constitutes a fueldeflector.
 2. A burner according to claim 1 wherein said lower face isin the form of a truncated cone so as to deflect the fuel upwards in aslanting manner.
 3. A gas burner according to claim 1 wherein the outerdiameter of the cover and deflector means is one-third to twice theinner diameter of the vertical generatrices defining the mixing chamber.